If I set these to 'No', should these hyperlinks (for example, if I try to make a comment and click 'Register) go to my default WordPress Login/Registration pages? Because they're not working properly if so because I get directed to the WPForo pages instead? Thanks.
Replace Registration Page URL to Forum Registration Page URL
Replace Login Page URL to Forum Login Page URL
Replace Reset Password Page URL to Forum Reset Password Page URL
If you have other pages for authorization, you need to fill those pages URL's in the appropriate fields. wpForo doesn’t change its own URLs, these options are only for another plugin compatibility. For example, if you use BuddyPress or Ultimate Member plugin you can set these values:
Login URL: /login/
Register URL: /register/